During my time reading the assorted editions of Mage the Ascension I encountered two different concepts, both named Domino Effect.
The Domino Effect v1
Is essentially a scheme employed by the awakened magician to turn a vulgar effect into a coincidental one via shadowing his true intention.
Example: If a mage wants a bungalow to explode, he can use a vulgar fireball. Using Domino Effect, the same mage can cause the gas valve to leak and a rat to chew on some wiring to cause a spark. This could be coincidental, but gas valves could be brand new and tested. So, the mage can add another domino piece to the effect, causing a car to ram into the house, disturbing the gas main, etc. The more domino pieces, the more coincidental the effect is.
The Domino Effect v2
It's essentially an local paradigm shift, based on gambler's fallacy. The idea is that with every coincidental but unlikely event in the same area the threshold of disbelief is lowered, as observers notice the low probability of all those things happening at once, making subsequent magick harder and harder (I remember additional +1 - +3 to difficulty) and ultimately vulgar . This is a rule to subvert casual use of intrinsically "soft" spheres like Entropy, Time (precognition) or Mind.
Say a covert combat between a technocracy agent and a Euthanatos mage happens on a suburban intersection. Truck nearly missing the mage (Mind) passes as coincidental, power outage (Forces) as well, but after the TV helicopter emergency lands on site (Entropy+Matter) and an enraged elk stampedes out of the nearby woods (Life+Mind), otherwise perfectly innocent effect like a convenient light change for the escaping mage turns out as very hard to pull off and vulgar. Note that non-magical complications do not strengthen the disbelief response, even if astronomically improbable.
So, my questions are: which one of those belongs to which edition (2nd ed and Revised)?
Are those two rules contradictory or not? It seems that v1 lowers the disbelief with each piece, while v2 increases the same.
Are there any guidelines on how exactly those are triggered and handled? Are there any lasting changes to local paradigm or do such actions have any specific resonance? How would the latter one be perceived from Umbra if at all?